You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
260 lines
9.4 KiB
260 lines
9.4 KiB
// plasmaWordIndexEntity.java
|
|
// --------------------------
|
|
// part of YACY
|
|
// (C) by Michael Peter Christen; mc@anomic.de
|
|
// first published on http://www.anomic.de
|
|
// Frankfurt, Germany, 2004
|
|
// last major change: 21.01.2004
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
// Using this software in any meaning (reading, learning, copying, compiling,
|
|
// running) means that you agree that the Author(s) is (are) not responsible
|
|
// for cost, loss of data or any harm that may be caused directly or indirectly
|
|
// by usage of this softare or this documentation. The usage of this software
|
|
// is on your own risk. The installation and usage (starting/running) of this
|
|
// software may allow other people or application to access your computer and
|
|
// any attached devices and is highly dependent on the configuration of the
|
|
// software which must be done by the user of the software; the author(s) is
|
|
// (are) also not responsible for proper configuration and usage of the
|
|
// software, even if provoked by documentation provided together with
|
|
// the software.
|
|
//
|
|
// Any changes to this file according to the GPL as documented in the file
|
|
// gpl.txt aside this file in the shipment you received can be done to the
|
|
// lines that follows this copyright notice here, but changes must not be
|
|
// done inside the copyright notive above. A re-distribution must contain
|
|
// the intact and unchanged copyright notice.
|
|
// Contributions and changes to the program code must be marked as such.
|
|
|
|
package de.anomic.plasma;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.util.Enumeration;
|
|
import java.util.Iterator;
|
|
import java.util.TreeMap;
|
|
|
|
import de.anomic.kelondro.kelondroRecords;
|
|
import de.anomic.kelondro.kelondroTree;
|
|
|
|
public class plasmaWordIndexEntity {
|
|
|
|
private String theWordHash;
|
|
private kelondroTree theIndex;
|
|
private TreeMap theTmpMap;
|
|
private File theLocation;
|
|
private boolean delete;
|
|
|
|
public plasmaWordIndexEntity(File databaseRoot, String wordHash, boolean deleteIfEmpty) throws IOException {
|
|
theWordHash = wordHash;
|
|
theIndex = indexFile(databaseRoot, wordHash);
|
|
theTmpMap = null;
|
|
delete = deleteIfEmpty;
|
|
}
|
|
|
|
public static boolean removePlasmaIndex(File databaseRoot, String wordHash) throws IOException {
|
|
File f = wordHash2path(databaseRoot, wordHash);
|
|
boolean success = true;
|
|
if (f.exists()) success = f.delete();
|
|
// clean up directory structure
|
|
f = f.getParentFile();
|
|
while ((f.isDirectory()) && (f.list().length == 0)) {
|
|
if (!(f.delete())) break;
|
|
f = f.getParentFile();
|
|
}
|
|
return success;
|
|
}
|
|
|
|
private kelondroTree indexFile(File databaseRoot, String wordHash) throws IOException {
|
|
if (wordHash.length() < 12) throw new IOException("word hash wrong: '" + wordHash + "'");
|
|
theLocation = wordHash2path(databaseRoot, wordHash);
|
|
File fp = theLocation.getParentFile();
|
|
if (fp != null) fp.mkdirs();
|
|
kelondroTree kt;
|
|
long cacheSize = theLocation.length();
|
|
if (cacheSize > 1048576) cacheSize = 1048576;
|
|
if (theLocation.exists()) {
|
|
// open existing index file
|
|
kt = new kelondroTree(theLocation, cacheSize);
|
|
} else {
|
|
// create new index file
|
|
kt = new kelondroTree(theLocation, cacheSize, plasmaURL.urlHashLength, plasmaWordIndexEntry.attrSpaceShort);
|
|
}
|
|
return kt; // everyone who get this should close it when finished!
|
|
}
|
|
|
|
public static File wordHash2path(File databaseRoot, String hash) {
|
|
// creates a path that constructs hashing on a file system
|
|
|
|
return new File (databaseRoot, "WORDS/" +
|
|
hash.substring(0,1) + "/" + hash.substring(1,2) + "/" + hash.substring(2,4) + "/" +
|
|
hash.substring(4,6) + "/" + hash + ".db");
|
|
}
|
|
|
|
public plasmaWordIndexEntity(String wordHash) {
|
|
// this creates a nameless temporary index. It is needed for combined search
|
|
// and used to hold the intersection of two indexes
|
|
// if the nameless intity is suppose to hold indexes for a specific word,
|
|
// it can be given here; othervise set wordhash to null
|
|
theWordHash = wordHash;
|
|
theIndex = null;
|
|
theLocation = null;
|
|
theTmpMap = new TreeMap();
|
|
}
|
|
|
|
public boolean isTMPEntity() {
|
|
return theTmpMap != null;
|
|
}
|
|
|
|
public String wordHash() {
|
|
return theWordHash;
|
|
}
|
|
|
|
public int size() {
|
|
if (theTmpMap == null) {
|
|
int size = theIndex.size();
|
|
if ((size == 0) && (delete)) {
|
|
try {
|
|
deleteComplete();
|
|
} catch (IOException e) {
|
|
delete = false;
|
|
}
|
|
return 0;
|
|
} else {
|
|
return size;
|
|
}
|
|
} else {
|
|
return theTmpMap.size();
|
|
}
|
|
}
|
|
|
|
public void close() throws IOException {
|
|
if (theTmpMap == null) {
|
|
if (theIndex != null) theIndex.close();
|
|
theIndex = null;
|
|
} else theTmpMap = null;
|
|
}
|
|
|
|
public void finalize() {
|
|
try {
|
|
close();
|
|
} catch (IOException e) {}
|
|
}
|
|
|
|
public boolean contains(String urlhash) throws IOException {
|
|
if (theTmpMap == null) return (theIndex.get(urlhash.getBytes()) != null); else return (theTmpMap.containsKey(urlhash));
|
|
}
|
|
|
|
public boolean contains(plasmaWordIndexEntry entry) throws IOException {
|
|
if (theTmpMap == null) return (theIndex.get(entry.getUrlHash().getBytes()) != null); else return (theTmpMap.containsKey(entry.getUrlHash()));
|
|
}
|
|
|
|
public boolean addEntry(plasmaWordIndexEntry entry) throws IOException {
|
|
if (theTmpMap == null) {
|
|
return (theIndex.put(entry.getUrlHash().getBytes(), entry.toEncodedForm(false).getBytes()) == null);
|
|
} else {
|
|
return (theTmpMap.put(entry.getUrlHash(), entry) == null);
|
|
}
|
|
}
|
|
|
|
public boolean deleteComplete() throws IOException {
|
|
if (theTmpMap == null) {
|
|
theIndex.close();
|
|
// remove file
|
|
boolean success = theLocation.delete();
|
|
// and also the paren directory if that is empty
|
|
if (success) {
|
|
File f = theLocation.getParentFile();
|
|
while ((f.isDirectory()) && (f.list().length == 0)) {
|
|
if (!(f.delete())) break;
|
|
f = f.getParentFile();
|
|
}
|
|
}
|
|
// reset all values
|
|
theIndex = null;
|
|
theLocation = null;
|
|
// switch to temporary more
|
|
theTmpMap = new TreeMap();
|
|
//theIndex.removeAll();
|
|
return success;
|
|
} else {
|
|
theTmpMap = new TreeMap();
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public boolean removeEntry(String urlHash, boolean deleteComplete) throws IOException {
|
|
// returns true if there was an entry before, false if the key did not exist
|
|
// if after the removal the file is empty, then the file can be deleted if
|
|
// the flag deleteComplete is set.
|
|
if (theTmpMap == null) {
|
|
boolean wasEntry = (theIndex.remove(urlHash.getBytes()) != null);
|
|
if ((theIndex.size() == 0) && (deleteComplete)) deleteComplete();
|
|
return wasEntry;
|
|
} else {
|
|
return (theTmpMap.remove(urlHash) != null);
|
|
}
|
|
}
|
|
|
|
public Enumeration elements(boolean up) {
|
|
// returns an enumeration of plasmaWordIndexEntry objects
|
|
if (theTmpMap == null) return new dbenum(up); else return new tmpenum(up);
|
|
}
|
|
|
|
public class dbenum implements Enumeration {
|
|
Iterator i;
|
|
public dbenum(boolean up) {
|
|
i = theIndex.nodeIterator(up, false);
|
|
}
|
|
public boolean hasMoreElements() {
|
|
return i.hasNext();
|
|
}
|
|
public Object nextElement() {
|
|
try {
|
|
byte[][] n = ((kelondroRecords.Node) i.next()).getValues();
|
|
return new plasmaWordIndexEntry(new String(n[0]), new String(n[1]));
|
|
} catch (IOException e) {
|
|
throw new RuntimeException("dbenum: " + e.getMessage());
|
|
}
|
|
}
|
|
}
|
|
public class tmpenum implements Enumeration {
|
|
TreeMap searchTree;
|
|
boolean up;
|
|
public tmpenum(boolean up) {
|
|
this.up = up;
|
|
searchTree = (TreeMap) theTmpMap.clone(); // a shallow clone that is destroyed during search
|
|
}
|
|
public boolean hasMoreElements() {
|
|
return searchTree.size() > 0;
|
|
}
|
|
public Object nextElement() {
|
|
Object urlHash = (up) ? searchTree.firstKey() : searchTree.lastKey();
|
|
plasmaWordIndexEntry entry = (plasmaWordIndexEntry) searchTree.remove(urlHash);
|
|
return entry;
|
|
}
|
|
}
|
|
|
|
public String toString() {
|
|
if (theTmpMap == null) return "DB:" + theIndex.toString();
|
|
else if (theTmpMap != null) return "MAP:" + theTmpMap.size() + " RECORDS IN " + theTmpMap.toString();
|
|
else return "EMPTY";
|
|
}
|
|
|
|
|
|
|
|
}
|